The D90 has a bright viewfinder that provides 96% coverage of the image captured on the sensor. In the viewfinder, the photographer will find 11 auto-focus points, including one cross type point, all of which are evenly disbursed in the viewfinder. While other cameras may have more, eleven auto-focus points provides sufficient focusing options without the viewfinder being cluttered with dozens of points. Most photographers prefer a lower number of auto-focus points, because they can be distracting and take away from the composition.

Unlike less expensive models such as the D40, D60, D3000 and D5000, the D90 has a built in autofocus motor, which means that all Nikon F-mount autofocus- lenses (the only exceptions being the AF-80mm f/2.8 Nikkor and the AF-200mm f/3.5 Nikkor, designed for the rare Nikon F3AF) can be used in autofocus mode. [4] G - It has a CPU so it will work with Nikon's 3D Color Matrix Metering II system. The G also means no aperture ring, you set the aperture only through the camera's controls. Speaking of aperture, the diaphragm in this lens is a 7-blade rounded-opening design, for nice round catchlights and more appealing bokeh. (A more natural blur for out-of-focus objects.) As with other cameras of this caliber, the D90 has a built in pop up flash, which is capable of providing flash in low light situations and at times where fill in flash is needed. Depending on how much the flash is used, the EN-EL3e battery will capture up to 850 images before being to be charged. Optional accessories include the GP-GPS unit, which allow images to be geo-tagged. However, the D90 does not have wireless of WIFI capabilities. Sensor cleaning. Nikon's multi-frequency sensor cleaning is also employed in the D90, vibrating the optical low-pass filter glass perpendicular to the plane, rather than parallel as most sensor cleaning systems do. Due to the extreme variability in types of dust in the environment, don't expect any sensor cleaning system to remove everything, but it's certainly better than no cleaning system at all. As noted above, functions and exposure modes available with a given lens will vary greatly with the lens type. More recent Nikkors (the G- or D-type models) include a microchip (CPU) that communicates focal-distance information to the camera. Lenses without the microchip won't support the 3D Matrix metering mode, and in fact all metering is disabled on the D90 when using a non-CPU lens. Most non-CPU lenses can be attached to the camera, but the shutter release will be disabled unless the camera is in Manual exposure mode, and AF, metering, electronic analog exposure display and TTL flash control can't be used.onfidence Nikon has in its performance has ruled out phase detection as a live-view option for the Nikon D90, and once other manufacturers deem their own contrast detection sufficient it’s likely Faster Shooting - Definitely! With a maximum continuous-mode frame rate of 4.5 frames/second, the Nikon D90 is 50% faster than the 3 frames/second of the D80. And it's not just the high end models that have lent features and technology to the D90; the user interface has been given the same user-friendly treatment as the D60, as have the retouching options. As it was explained to us the D90 is intended to appeal to the broadest audience of any Nikon SLR, from first-time 'step up' customers moving from a compact to serious amateurs wanting comprehensive photographic control without the cost and weight of a D300. Whether the D90 is as capable as its feature set suggests, we'll see as the review unfolds. Nikon D90 Key Features

Here’s a shot I haven’t taken in a while. This isn’t under-exposure, it was a really gloomy day in Sidmouth. If you can get focus, you still can't set exposure. Exposure seems to run off on its own. In dim light the D90 applies hellaicious amounts of noise reduction to the additional ISO it piles on. The meter seems identical to the D300 and D3. The defective meter of the D40 and D80, which often overexposed, is gone. Burian, Peter K. (2009-02-19). "NIKON D90 Review: Field Test Report". Photocrati . Retrieved 2009-10-25.

D90 Summary

The Nikon D90 is a 12.3 megapixel digital single-lens reflex camera (DSLR) model announced by Nikon on August 27, 2008. It is a prosumer model that replaces the Nikon D80, fitting between the company's entry-level and professional DSLR models. It has a Nikon DX format crop sensor. On the other hand, the Nikon D80 has its merits, such as being more affordable and lightweight compared to the D90. However, these benefits do not outweigh the advantages of the D90 in terms of optics.

Large capacity SD/SDHC memory card. These days, a 2GB or 4GB card is inexpensive enough, and you'll want a large card if you plan on recording many HD movies. Good to buy a higher-speed card also, able to record fast enough to not limit movie duration simply due to card speed. (SanDisk Ultra/Extreme III, Kingston 133x or equivalent) The main difference between the DX sensor and the full frame sensor is the crop factor of 1.5x used in these sensors. What this means is that normal lenses are longer, when used on a camera such as a D90, than they would on a full frame camera, such as the D600 or D810. An example of this would be the image captured on a 50mm prime lens on a D90 would be the same as an identical image taken using a full frame D600 or D810 using a 75mm lens. It is important to note that cropped sensor cameras as not inferior to full frame cameras. In fact many professional and wildlife photographers prefer cropped sensor cameras because it makes their existing lenses longer, allowing them to get closer to their subject. The D90 is worlds beyond the old first-generation D80, which it replaces as Nikon's mid-line DSLR.The Nikon D90 is a D80 with Live View, ADR, an almost three-dimensional 3" LCD, it can shoot movies, and has far more advanced ergonomics. Chromatic Aberration Correction - Definitely! To our minds, not enough has been made of this feature on the D90. Chromatic aberration is what causes the purple and green fringes you often see around the edges of high-contrast objects in the corners of the frame. CA is a particular issue in zoom lenses, particularly ones with long zoom ratios. Depending on the subject you're shooting, it may be more or less of a problem, as it's generally restricted to the corners and edges of the frame. I find it very distracting though, and have seen many otherwise good images ruined by it. The D90 corrects this to an amazing degree, turning lenses I'd otherwise consider marginal into excellent performers. To my mind, this alone could be reason enough for a D80 owner to upgrade to a D90 body. The kit lens for the D80 was Nikon's 18-135mm optic. This was a very sharp lens, but it also showed a lot of chromatic aberration in the corners. On the Nikon D90, this lens turns into a beautiful performer in nearly every respect. The D90's own 18-105mm optically stabilized kit lens also has only so-so CA performance on its own, but combined with the D90's distortion-reduction processing turns into a stellar performer. The rotation sensor is worse then the D3; it's not unusual for it to get fooled. No big deal, it's easy to right these later.segment RGB Color Matrix with face detection. Center-weighted and spot for old-timers, too. Movie mode only uses Matrix. Non-CPU: Autofocus not supported. Can be used in exposure mode M, but exposure meter does not function. Electronic rangefinder can be used if lens has a maximum aperture of f/5.6 or faster. The Nikon D90 matches the more expensive D300 for resolution, in offering a newly designed 12.3MP DX-format sensor. Unlike the Nikon D80, the Nikon D90 uses the CMOS sensor technology that has been implemented in all three of Nikon’s current professional DSLRs, signalling that CCD chips may soon be confined to entry-level DSLR models, if they are used at all. The D90’s sensor has been fitted with a self-cleaning unit to minimise the effects of dust incursion on images, while the Nikon’s EXPEED processing concept handles image processing and operation. Nikon D90 Review – ISO Range and Active D-Lighting Built-in flash supports Nikon's Creative Lighting System (wireless flash control) with any CLS-capable external flash units. (Camera can be controller, no need for separate flash to be attached to the camera as a controller.) Nikon finally fixed the design flaw where by default the Modeling Flash fired if you hit the Depth-of-Field preview button. Thank you Nikon!